Add Spec-Driven Development workflow documentation

This file outlines the Spec-Driven Development workflow using the speckit toolset, detailing the sequence of commands and core rules for implementation.

Author: AIstar007

templates/commands/skill.md

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+---
+name: "speckit"
+description: "Full Spec-Driven Development (SDD) workflow powered by github/spec-kit. Use speckit-specify to start a feature, then speckit-plan, speckit-tasks, and speckit-implement in sequence."
+metadata:
+  author: "github-spec-kit"
+  source: "https://github.com/github/spec-kit"
+  version: "1.0.0"
+---
+
+# Spec Kit — Spec-Driven Development
+
+This skill provides the complete Spec-Driven Development workflow from [github/spec-kit](https://github.com/github/spec-kit).
+Individual commands are available as separate skills in this directory — each one maps to a phase of the SDD process.
+
+## Workflow Order
+
+Always follow this sequence — never skip phases:
+
+1. **speckit-constitution** — Establish project governing principles *(run once per project)*
+2. **speckit-specify** — Turn a feature description into a structured spec
+3. **speckit-clarify** — Resolve ambiguities before planning *(optional but recommended)*
+4. **speckit-plan** — Create a phased technical implementation plan
+5. **speckit-analyze** — Cross-artifact consistency check *(optional, run after tasks)*
+6. **speckit-tasks** — Break the plan into ordered, executable tasks
+7. **speckit-implement** — Execute tasks one by one
+8. **speckit-checklist** — Post-implementation quality checklist
+
+## Core Rules
+
+- Read `.specify/memory/constitution.md` before every coding decision
+- Show the spec summary to the user and wait for approval before planning
+- Show task count to the user and wait for approval before implementing
+- Use `.specify/scripts/bash/` (Linux/macOS) or `.specify/scripts/powershell/` (Windows) for all file and branch operations
+- Never create, move, or delete files in `specs/` without explicit user instruction
+
+## Key File Locations
+
+| File | Purpose |
+|------|---------|
+| `.specify/memory/constitution.md` | Project governing principles — read before every decision |
+| `specs/<feature>/spec.md` | Feature specification created by `speckit-specify` |
+| `specs/<feature>/plan.md` | Implementation plan created by `speckit-plan` |
+| `specs/<feature>/tasks.md` | Task breakdown created by `speckit-tasks` |
+| `.specify/templates/` | Base templates for spec, plan, tasks, and checklist artifacts |
+| `.specify/scripts/` | Automation scripts for branch and file management |